.I moaned and groaned about my daughter who get 12 week B12 when she has presented with neurological problems and BNF 'recommends' is every 8 weeks FOREVER.I wrote to NICE and had a bit of a non committal reply and harassed my daughter to go with findings to her GP.....anyway 2 months on she went today saw a locum who said she would investigate and call her back.Good to her word she called her back and....WAIT FOR IT ...AGREED to every 8 weeks the caveat is its only for the next 6 months as daughter low in vit D and doc says that may have caused her numbness (even with injections daughters count only 150) but good on this GP taking the time.